【摘要】 鉴于城市高架桥梁GPS控制网的线型特点和要求,结合某城市区域高架桥梁GPS控制网建立的实例,探讨GPS技术在城区高架桥梁控制网建立过程中的一些问题,诸如等级确定、网型结构、强度增加、重点观测等。通过该网的建立,获得了某城市高架桥梁规划设计、建设、监测等的平、高基准。该网针对某一25km长的大型高架桥梁工程所建,分段施工,验收各分段桥面对接的平、高方向最大误差分别为±1.1cm和±1.8cm,远小于工程对接限差±5cm,证明本文的所述方法和做法具有重要的实用价值和示范作用。更多还原

【Abstract】 For the characteristics and requirements of GPS control network of City viaduct,combined the instance of the establishment of a City viaduct GPS control network,some problems in the establishment of GPS control network of City viaduct are discussed,such as the level determination,the structure of the grid,strength increase,focus observations and so on.Through the establishment of the control network,the horizontal and vertical datum of the city viaduct in design,construction and monitor are gotten.This network was designed for a 25 km-long-viaduct.The acceptance check of subparagraphs deck docking,the horizontal and vertical maximum error was± 1.1 cm and 1.8 cm respectively far less than the tolerance error ± 5 cm of perforation project.The instance proved the methods and practices discussed in this paper have important practical value and exemplary role.更多还原